"This is our main reference system, but today I must leave the stream to cross the ridge."
"So I can also observe the phototropism of the vegetation. Watch carefully," he pointed to the trunk of a large tree.
"In the Northern Hemisphere, the side of the trees facing south, because they receive more sunlight, usually has more lush foliage, and the bark is drier."
"While the north-facing side is more prone to moss and lichen growth. This is not absolute, but by observing multiple trees, you can derive a high probability of the correct direction."
"We can also use the wind direction and the terrain features. The Ailao Mountain is affected by the southwest monsoon, and the wind mostly comes from a fixed direction."
"By judging the tilt direction of the canopy to determine the perennial wind direction, and remembering which direction you came from on the slope, you move approximately parallel to the contour lines."
